CN101984327A - Fracture model resetting detection device and detection method thereof - Google Patents

Abstract

The invention discloses a fracture model resetting detection device and a detection method thereof. The fracture model resetting detection device comprises a simulation limb model, triaxial accelerometer chips, a displacement sensor and a signal processing circuit. A skeleton anatomical model forming the natural cross section is arranged in the simulation limb model, and grooves are arranged respectively at the positions of the two end surfaces of the fracture cross section having the smallest distance. The triaxial accelerometer chips having the same direction are respectively arranged in the grooves, and the displacement sensors are symmetrically arranged at the two end surfaces of the fracture cross section, and the displacement sensors and the triaxial accelerometer chips are respectively connected with wires. The wire is led out from the simulation limb model and is connected with the signal processing circuit, and the signal processing circuit is connected with an upper computer. In the invention, the combination of the accelerometers is adopted for the first time in the similar methods. The device of the invention has small size and is convenient to install, and has no influence on the appearance of the fracture and the relative operation.

Description

A kind of fracture model reset detection device and detection method

Technical field

The present invention relates to sensor and medical teaching field, specifically refer to pick-up unit and method solid section end positions recovery effect (as the simulation reduction of the fracture, fixing).

Technical background

Fracture is a common diseases in first aid and the institute, and in war and earthquake disaster, it is nearly 30% that the incidence of disease can reach, and is the important topic of medical circle to the processing of fracture.At the scene or pre hospital care, need fix, in institute, need reset with fixing fracture patient to fracture patient.Manipulative reduction is important techniques of orthopedics and traumatology of Chinese medicine, the training that resets of the existing fracture fixation that medical personnel are carried out is by books explanations substantially, watches simulated training on anatomical model, the normal person's health, accumulation to modes such as patient handling experiences, because the beginner lacks experience, processing experience when the normal person can't obtain fracturing again on one's body, and easily patient being caused how unnecessary misery on the one hand on one's body by accumulating experience patient, patient is difficult for accepting; On the other hand some uncommon cases are difficult to the acquisition experience.Anthropomorphic dummy's technology of rising in recent years then is expected to address this problem, by the simulation of anthropomorphic dummy to human anatomic structure and illness, make the trainee can repeat to obtain experience, for the training of relevant medical technology provides the scientific and reliable platform near true case.

Invention 98112545.X " fracture, dislocation manipulative reduction model " has designed a model that is used for the simulated training of reduction of the fracture gimmick exactly.It draws up the character modules of human body multiple fracture come with machinery, electronic technology first, can carry out the manipulative reduction exercise, and can the success or not of acousto-optic indication manipulative reduction.The trunk of this model is a steel-wood structure, and bone is that polyvinyl chloride is moulded rod firmly, and muscle is made of black rubber band and extension spring, and flat platysma is simulated with the sponge sheet, and skin is imitated with leatheret.The high 160cm of model, heavy 30kg can crouch and can sit.Be divided into unlatching, solid lock, circuit, control four big systems.The advantage of this model be can open, control such as solid lock, and the acousto-optic hint success that whether resets is arranged.Its detection to fracture face is the device that the band spring by projection triggers screw and groove contraposition, when forming contraposition, triggers screw and springs in the groove, thus trigger switch, the success that resets of circuit acousto-optic hint.Method is simple for this, reliable, but also have obvious defects:

1. the model emulation degree is not high.The first step of human fracture's manipulative reduction is " hand is touched heart meeting ", emphasize touch by hand, understand the fracture state of an illness, comprise degree of misalignment, the rotation displacement of position, the anatomical structure of fracture or shorten the situation etc. of displacement, thereby form three-dimensional impression, study gimmick and the step that resets again fracture site.And the dissection shape fabricating that invention 98112545.X does not press skeleton, the shift separation that fracture is related to, lateral displacement, shortening displacement, angulation displacement, rotation displacement etc., can not simulate well, also need to design comparatively regular section and could finish operations smoothly, be not inconsistent with human fracture's complex situations, be difficult to obtain the training effect of " hand is touched heart meeting "; This invention detects the method that resets because more physical construction is arranged, and itself may cause interference to reseting procedure, and the feasible feel that resets is untrue.

2. detection method is inaccurate.What this invention was adopted is to trigger screw contact conducting to point out the mode of the success that resets, have only two kinds of success, failures for reset effect, can not carry out multi-level evaluation to the effect that resets, but as excellent, very, still grade evaluation and fully anatomical reduction, nearly anatomical reduction, be lower than 3/4 anatomical reduction etc., more the shift separation that can not relate to fracture, lateral displacement, shortening displacement, angulation displacement, rotation displacement etc. detect respectively.This invention detects the method that resets and does not consider the rotation displacement and the detection of fracturing, and its principle still may be judged as the case of successful that resets when existing rotation displacement serious.

3. this invention can not be understood the situation of the reduction of the fracture in real time.

Summary of the invention

The objective of the invention is to overcome the deficiency that existing structure exists, a kind of reduction of the fracture pick-up unit and inspection method are provided.

Fracture model reset detection device of the present invention comprises emulation limbs model, three axis accelerometer chip, displacement transducer and signal processing circuit; The skeleton dissection model that forms natural section is set in the described emulation limbs model, establish groove respectively in fracture face both ends of the surface minimum distance, the identical three axis accelerometer chip of difference installation direction in described groove, at fracture face both ends of the surface symmetry installation position displacement sensor, described displacement transducer is connected lead respectively with the three axis accelerometer chip, lead is derived from emulation limbs model and is connected to signal processing circuit, and signal processing circuit connects host computer.

Described three axis accelerometer is acceleration sensor chip or acceleration pickup, quantity is no less than two, described three axis accelerometer is installed on the fracture face two ends respectively and presses close to the rupture surface place, when bone resets fully, each three axis accelerometer dimensional orientation is identical, and same directional acceleration value all equated when placed each three axis accelerometer optional position.

Described displacement transducer is made up of grid contact rheostat part and contact probe portion, grid contact rheostat partly adopts hardboard as double-deck PCB circuit board (also can with other plate), one side is the circular annular conductors film grid alternate with insulator film, another side welds fixed resistance between two conductor loops, the contact probe is installed on the geometric center of a fracture face, and grid contact rheostat is installed on another section.

Fracture model reset detection method of the present invention, realize according to following step:

A. the initialization of section two ends is provided with, and shows initial shift parameters simultaneously;

B. next step carries out reset operation, and displacement transducer is installed on the section two ends, and conducting during the section contact is if reset operation is then carried out in not conducting of displacement transducer again;

C. if the displacement transducer conducting, output voltage, the success of shortening that displacement resets and shift separation resets; According to the distance of output voltage derivation contact probe to the grid center, judge the reset case of lateral displacement, show the lateral displacement value, distance is more little, and it is good more to reset, and when distance was zero, lateral displacement resetted fully; If dissatisfied, then continue reset operation to reset case;

D. if lateral displacement resets satisfied, then static, poor according between three the directional acceleration values of two accelerometers that lay respectively at the section two ends under the relative static conditions, calculate and show the reset case of section angulation displacement, rotation displacement, three axis accelerometer described in this process can not be positioned at a certain direction position identical or opposite with the acceleration of gravity direction; Dissatisfied as if reset case is had, then continue reset operation; If all satisfied then the resetting of angulation displacement, rotation displacement finished;

E. reset to finish and carry out fixing operation, according to load external force make total acceleration difference that two accelerometers laying respectively at the section two ends under the motion state of section two ends note and with the ratio of total acceleration, judge the effect that the section two ends are fixing, the relative total acceleration of difference is more little, fixing firm more, the relative total acceleration of difference is big more, fixedly overrelaxation; If dissatisfied, then continue fixing operation; If satisfied, then fixedly finish.

The inventive method also can be used for other similar field, as the faying face relative displacement detection etc. of machinery or building.

The invention has the beneficial effects as follows: the present invention is the combination of first Application accelerometer in class methods, volume is small and exquisite, the convenient installation do not influence the profile and the associative operation (for example reduction of the fracture model can adopt the model bone with precise anatomical structure that anatomic teaching is used) of fracture material substantially; Adopt grid contact rheostat as the distance between two points sensing device first, detect shift separation, shorten displacement, the particularly reset case of lateral displacement; The rotation that section restores, one-tenth angle, shortening, separation, lateral displacement etc. all can obtain in real time, the accurate detection, and can provide real-time numerical quantization judgement to recovery effect by intelligent evaluation software, improved the training effect of accuracy of detection and model greatly.

Description of drawings

Fig. 1 is the device overall schematic, and Fig. 1 a partly is whole signal, and Fig. 1 b partly is the fracture site enlarged diagram;

Fig. 2 is 3 axis accelerometers, 3 directional acceleration value synoptic diagram under static state;

Fig. 3 is the rheostatic grid face of grid contact;

Fig. 4 is the rheostat schematic diagram that grid face and fixed resistance constitute;

Fig. 5 is grid contact rheostat and contact probe circuit schematic diagram;

Fig. 6 is grid contact rheostat and contact probe scheme of installation on fractured bones;

Fig. 7 is the system electrical schematic diagram;

Fig. 8 is the process flow diagram of this detection method implementation step.

Specific embodiment

The present invention is directed to common breaking property fracture, the bigger fracture of destructiveness such as the fracture of non-breaking property and comminuted fracture are not related to.With the simulated training that resets of upper limbs fracture of shaft of humerus is example, introduces the concrete application of this method.

It at first is modelling.As shown in Figure 1, comprising far-end accelerometer 1, near-end accelerometer 2, fracture far-end 3, fracture near-end 4, circuit lead 7, contact probe 8, the rheostatic grid face 9 of grid contact is dissected skeleton model 10, simulation soft tissue 11, simulated skin 12, fracture site 13, simulate muscular 14.Adopt the skeleton dissection model of making as materials such as PVC duroplastss 10 to make its " humerus " fracture (the fracture form is looked the training need design), form natural section 13 by applying external force.Press close to the place in side, fracture face two ends and establish groove respectively, under the complete anatomical reduction state of fracture, far-end accelerometer 1 is installed respectively in groove, near-end accelerometer 2, adjusting its position by the two output signal contrast puts, reaching three direction acceleration equates in acceptable error range, notice that simultaneously can not influence section after accelerometer is installed resets, install the rear enclosed groove, restore bone side anatomical structure.

At installation position, section center, two ends displacement sensor, be used to detect the reset case of fracture face separation, shortening, lateral displacement.Wherein dig out groove on the section of bone one end the rheostatic grid face 9 of grid contact is installed, other end section is installed the rheostatic contact of grid contact probe 8, and displacement transducer and accelerometer together are connected to signal processing circuit with lead 7.Described displacement transducer is made up of grid contact rheostat part and contact probe portion, shown in accompanying drawing 3-6, grid contact rheostat adopts a hardboard (as double-deck PCB circuit board), one side is processed into the alternate grid (accompanying drawing 3) of circular annular conductors film 5 and insulator film 6, another side welds fixed resistance (accompanying drawing 4) between two conductor loops, can and the quantity and the maximum radius of circular annular conductors ring on the grid face be set to the needs of precision according to the thickness of bone.Detection is finished by Circuits System, and grid face end applies certain voltage vcc to the fixed resistance of polyphone, and two end nodes of each resistance are connected with conductor loops respectively, when sound end touches a certain conductor loops, export certain voltage Vo (accompanying drawing 5).The voltage of probe output is corresponding one by one with the distance that resistance value, probe arrive key center, thereby detects the distance that probe voltage is deducibility probe and key center, and then judges the degree that resets of fracture lateral displacement.

Adopt the important load muscle 14 of rubber belt simulation fracture, the rubber belt two ends are individually fixed in the attachment point position of muscle at bone, utilize the elastic force of rubber belt to make the dislocation of fracture two ends form the fracture form.Adopt bone, the muscle of foam sponge parcel model, simulate other soft tissue 11, form the upper limbs profile, outside foam sponge, wrap up in pellosil, simulation human body skin 12.Foam sponge, silica gel all in the mould of dissecting configuration design according to human upper limb injection moulding finish, make it have good profile and feel fidelity.According to the medical science empirical value and the human body soft tissue mechanical characteristic of fracture region of interest tractive force, the gas-development agent material rate of adjusting foam sponge reaches similar to tissue.

The three axis accelerometer chip can adopt the MMA7260 of Freescale Freescale company, the BMA140 of BOSCH company, unites the reset case of the rotation that is used for comprehensively judging section, angulation displacement etc.

Described signal processing circuit has the function that accelerometer and displacement transducer signal are handled, can calculate the occurrence of lateral displacement, angulation displacement, rotation displacement according to signal and corresponding calculation method, host computer can further be handled, show, analyze according to these parameters.Signal processing circuit can adopt the treatment circuit of data collecting card N16229 or design voluntarily etc.

Design of electrical system as shown in Figure 2, acceleration is taken into account the rheostatic power supply of grid contact and signal transmission wire and is derived from the upper limbs model, links to each other with signal processing circuit.Signal processing circuit is positioned at outside the model, to the accelerometer power supply, gathers accelerometer and displacement transducer information, and carries out Filtering Processing.Under static state, the acceleration information that collects is analyzed, handled and judges.And can degree of will speed up signal or result send to host computer, further handle.Host computer can carry out further intelligent evaluation by supporting software, provides gimmick suggestion and reset effect in real time.

The shift separation of the reduction of the fracture, lateral displacement, angulation displacement, rotation displacement all can detect by native system, shorten displacement and also can carry out easy detection by grid contact rheostat, (dotted line is represented data transfer among the figure for its flow process such as accompanying drawing 8, solid line represents to carry out flow process), the concrete foundation and the method for detection are respectively:

1, shift separation, shortening displacement and lateral displacement: detect by displacement transducer.As long as probe touches conductor loops, circuit turn-on shows that section is in contact with one another, shift separation and shorten the displacement success that just resets.

When probe touched the conductor loops of outermost, the lateral displacement degree that resets was detectable minimum, if need measure the littler degree that resets, more multiprobe can be set.Probe and key center are approaching more, and the conductor loops radius that touches is more little, and lateral displacement is also more little, and its occurrence is the conductor loops radius that is touched.When probe touched the center of circle, the side displacement was zero, resets fully.The radius of supposing width, the width between annulus and the center conductor disk of each conductor annulus is r, and the resistance between two annulus equates, and is far smaller than probe to earth resistance Ro, i.e. R ₀=R ₁=R ₂=R ₃=R ₄=R ₅=R, Ro＞＞R, the voltage that circuit applies is Vcc, and this moment, the diameter of conductor probe should be greater than r, and this rheostat is 2r to the resolution of displacement, when probe touches the conductor loops of outermost, lateral displacement is 11r, output voltage V o=V5=Vcc, and this moment, the reset rate of lateral displacement was 50%, probe is every to the close annulus of center disk, and output voltage reduces

Reset rate improves

If 75% reset rate that will reach MA should allow at least probe touch from outside several the 4th conductor loops, at this moment, output voltage is

Reset rate is

Can adjust the size of r and the distribution of conductor loops according to needs to the resolution that resets.

2, angulation displacement, rotation displacement: angle in 90 degree scopes the time by two 3 axis accelerometer joint-detection.As shown in Figure 2, under static state, 23 axis accelerometers only are subjected to the acceleration of gravity effect, and 3 directional acceleration values are kept a stable value.3 directions of 3 axis accelerometers orthogonal (X, Y, Z3 direction), and constant with respect to accelerometer, in any one direction that accelerometer is put, only be subjected under the stationary state acceleration of gravity (

Vector, down with) influence, the angle of establishing 3 directions and acceleration of gravity is respectively α, beta, gamma, 3 directional accelerations ( Vector, down with) vector and equal acceleration of gravity (if with the acceleration of gravity direction for just, then acceleration of gravity and accelerometer direction angulation be less than 90 spend acute angle the time, this directional acceleration value is for just; Acceleration of gravity and accelerometer direction angulation are during greater than the obtuse angle of 90 degree, and this directional acceleration value is for negative):

${\stackrel{I}{a}}_x+{\stackrel{I}{a}}_y+{\stackrel{I}{a}}_z=\stackrel{I}{g}---\left[1\right]$

Then its 3 directional acceleration values are respectively:

$\left\{\begin{array}{c}{\stackrel{r}{a}}_x=\stackrel{r}{g}\·\cos \mathrm{\α}\\ {\stackrel{r}{a}}_y=\stackrel{r}{g}\·\cos \mathrm{\β}\\ {\stackrel{r}{a}}_z=\stackrel{r}{g}\·\cos \mathrm{\γ}\end{array}\right.---\left[2\right]$

3 directions and gravity direction angle are respectively:

$\left\{\begin{array}{c}\mathrm{\α}=\mathrm{arc}\cos \frac{{\stackrel{r}{a}}_x}{\stackrel{r}{g}}\\ \mathrm{\β}=\mathrm{arc}\cos \frac{{\stackrel{r}{a}}_y}{\stackrel{r}{g}}\\ \mathrm{\γ}=\mathrm{arc}\cos \frac{{\stackrel{r}{a}}_z}{\stackrel{r}{g}}\end{array}\right.---\left[3\right]$

With the upper arm fracture of humerus is example (accompanying drawing 1), and initial the installation makes two accelerometers be in approximately uniform state, and three directions are identical respectively, and angulation is zero, and all directions accekeration equates respectively.Identical with the humerus longitudinal direction under the original state is the Y direction of accelerometer.According to formula [3], under the stationary state, 2 three directions of far-end accelerometer 1 and near-end accelerometer (X1, Y1, Z1, X2, Y2, Z2) angle with the acceleration of gravity direction is (α ₁, β ₁, γ ₁, α ₂, β ₂, γ ₂),

When far-end accelerometer 1 and three directional accelerations of near-end accelerometer 2 were all non-vanishing, generally, the one-tenth angle of fracture and rotation displacement were less than 90 degree, and three directions of two accelerometers are respectively with the difference at angle that gravity direction becomes:

$\left\{\begin{array}{c}\mathrm{\Δ\α}={\mathrm{\α}}_1-{\mathrm{\α}}_2=\mathrm{arc}\cos \frac{{\stackrel{r}{a}}_{x1}}{\stackrel{r}{g}}-\mathrm{arc}\cos \frac{{\stackrel{r}{a}}_{x2}}{\stackrel{r}{g}}\\ \mathrm{\Δ\β}={\mathrm{\β}}_1-{\mathrm{\β}}_2=\mathrm{arc}\cos \frac{{\stackrel{r}{a}}_{y1}}{\stackrel{r}{g}}-\mathrm{arc}\cos \frac{{\stackrel{r}{a}}_{y2}}{\stackrel{r}{g}}\\ \mathrm{\Δ\γ}={\mathrm{\γ}}_1-{\mathrm{\γ}}_2=\mathrm{arc}\cos \frac{{\stackrel{r}{a}}_{z1}}{\stackrel{r}{g}}-\mathrm{arc}\cos \frac{{\stackrel{r}{a}}_{z2}}{\stackrel{r}{g}}\end{array}\right.---\left[4\right]$

These three parameters can be pointed out the degree that resets, and are worth greatly more, and fracture two ends angulation is big more, and the degree that resets is low more; Be worth more for a short time, the degree that resets is high more; Three when being equal to zero, reset fully.When three parameters all than hour because medically the reseting precision of fracture to be required be not very high, can be approximated to be the angle of angulation displacement and rotation displacement.Wherein Δ β can be similar to the angle of regarding the humerus angulation displacement as, Δ β hour, Δ α and Δ γ can be similar to the angle of regarding the humerus rotation displacement as.Special case is when a certain direction of accelerometer is identical with the acceleration of gravity direction or opposite, have certain or certain both direction and be on the surface level vertical with the acceleration of gravity direction this moment, the any direction accekeration is zero situation in this plane, causes this method to lose efficacy, and should give and avoids.When vertically placing as humerus, Y directional acceleration value maximum, X, the Z direction is simultaneously vertical with the acceleration of gravity direction, and acceleration is approximately zero, this moment X, the plane that the Z both direction constitutes is vertical with acceleration of gravity, if angulation displacement resets the X of two accelerometers fully, the Z direction is zero, can't accurately measure Δ α and Δ γ.Thus, by the accekeration of two three axis accelerometers, can calculate Δ β, Δ α and Δ γ obtain angulation displacement, rotation displacement angle value.

3, Gu Ding detection and evaluation: when two accelerometers lay respectively at the section two ends of fracture, if a certain end applies a turning moment in the fixed head vertical direction, make it rotate to another orientation, then on three directions of two accelerometers, have corresponding variation, if it is fixed fastening, then the two is equivalent on same rigid body, its acceleration change approximately equal; If fixing comparatively loose, then difference is very big with it for acceleration change.Should move under external force or rotate, calculate two accelerometer accelerations and poor (be that total acceleration is poor, the total acceleration of a certain position be exactly accelerometer the acceleration of three directions of a certain position and) Δ α, the relative changes delta α ' according to acceleration judges (formula [5]-[8]) again.The judgement of fixing effect that resets after the success still can be investigated Δ a ' value under slowly moving, rotating.Owing to fixedly be not to be tight more good more, the needs to fastening degree on the synthetic medicine are set a best Δ a ' value, and are good more near Δ a ' fixed effect more, otherwise poor more.

$a_1=\sqrt{{{\stackrel{r}{a}}_{x1}}^2+{{\stackrel{\mathrm{<figure-callout\; id="1"\; label="r\; y"\; filenames="HDA0000025059110000031.png"\; state="\{\{state\}\}">r</figure-callout>}}{a}}_y}^2+{{\stackrel{\mathrm{<figure-callout\; id="1"\; label="r\; z"\; filenames="HDA0000025059110000031.png"\; state="\{\{state\}\}">r</figure-callout>}}{a}}_z}^2}---\left[5\right]$

$a_2=\sqrt{{{\stackrel{r}{a}}_{x2}}^2+{{\stackrel{\mathrm{<figure-callout\; id="2"\; label="r\; y"\; filenames="HDA0000025059110000011.png"\; state="\{\{state\}\}">r</figure-callout>}}{a}}_y}^2+{{\stackrel{\mathrm{<figure-callout\; id="2"\; label="r\; z"\; filenames="HDA0000025059110000011.png"\; state="\{\{state\}\}">r</figure-callout>}}{a}}_z}^2}---\left[6\right]$

Δa＝|a ₁-a ₂| [7]

$\mathrm{\&Delta;}{a}^{\&prime;}=\frac{\mathrm{\&Delta;a}}{a_1}---\left[8\right]$

Claims (6)

1. a fracture model reset detection device is characterized in that, described device comprises emulation limbs model, three axis accelerometer chip, displacement transducer and signal processing circuit; The skeleton dissection model that forms natural section is set in the described emulation limbs model, establish groove respectively in fracture face both ends of the surface minimum distance, the identical three axis accelerometer chip of difference installation direction in described groove, at installation position, fracture face two ends displacement sensor, described displacement transducer is connected lead respectively with the three axis accelerometer chip, lead is derived from emulation limbs model and is connected to signal processing circuit, and signal processing circuit connects host computer.

2. fracture model reset detection device according to claim 1, it is characterized in that, described three axis accelerometer is acceleration sensor chip or acceleration pickup, quantity is no less than two, described three axis accelerometer is installed on the fracture face two ends respectively and presses close to the rupture surface place, when bone resetted fully, each three axis accelerometer dimensional orientation was identical, and same directional acceleration value all equated when placed the optional position.

3. fracture model reset detection device according to claim 1, it is characterized in that, described displacement transducer is made up of grid contact rheostat part and contact probe portion, grid contact rheostat partly adopts the hardboard of double-deck PCB circuit board, one side is the circular annular conductors film grid alternate with insulator film, and another side welds fixed resistance between two conductor loops; The contact probe is installed on the geometric center of a fracture face, and grid contact rheostat is installed on another section.

4. a fracture model reset detection method is characterized in that, realizes according to following step:

A. the initialization of section two ends is provided with, and shows initial shift parameters simultaneously;

B. next step carries out reset operation, and displacement transducer is installed on the section two ends, and conducting during the section contact is if reset operation is then carried out in not conducting of displacement transducer again;

C. if the displacement transducer conducting, output voltage, the success of shortening that displacement resets and shift separation resets; According to the distance of output voltage derivation contact probe to the grid center, judge the reset case of lateral displacement, show the lateral displacement value, distance is more little, and it is good more to reset, and when distance was zero, lateral displacement resetted fully; If dissatisfied, then continue the lateral displacement reset operation to the lateral displacement reset case.

5. fracture model reset detection method according to claim 4, it is characterized in that, if described lateral displacement resets satisfied, then static, poor according between three the directional acceleration values of two accelerometers that lay respectively at the section two ends under the relative static conditions, calculate and show the reset case of section angulation displacement, rotation displacement, three axis accelerometer described in this process can not be positioned at a certain direction position identical or opposite with the acceleration of gravity direction; Dissatisfied as if reset case is had, then continue reset operation; If all satisfied then the resetting of angulation displacement, rotation displacement finished.

6. fracture model reset detection method according to claim 5, it is characterized in that, reset after described angulation displacement, rotation displacement are all satisfied and finish, carry out fixing operation, according to load external force make total acceleration difference that two accelerometers laying respectively at the section two ends under the motion state of section two ends note and with loading external force before the ratio of total acceleration, judge the effect that the section two ends are fixing, the relative total acceleration of difference is more little, fixing firm more, the relative total acceleration of difference is big more, fixedly overrelaxation; If dissatisfied, then continue fixing operation; If satisfied, then fixedly finish.

Images